package com.heima.comment.config;

import com.heima.model.user.pojos.ApUser;
import com.heima.utils.common.AppJwtUtil;
import com.heima.utils.thread.ApThreadLocal;
import io.jsonwebtoken.Claims;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.Optional;

/**
 * 自定义的拦截器
 */
public class MvcHandleInterceptor implements HandlerInterceptor {
    //方法之前执行
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        //1.从请求头中获取token
        String token = request.getHeader("token");
        Optional<String> optional = Optional.ofNullable(token);
        if(optional.isPresent()) {
        //2.解析token,获取用户id
        Claims claimsBody = AppJwtUtil.getClaimsBody(token);
        if(claimsBody!=null){
            Integer userId = (Integer) claimsBody.get("id");
            //3.存入threadLocal中
            ApUser apUser = new ApUser();
            apUser.setId(userId );
            ApThreadLocal.setApUser(apUser);
        }
        }
        return true;
    }
    //方法之后执行
    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
        //从threadLocal中清除用户信息
        ApThreadLocal.removeApUser();
    }
}